Plate type burner

ABSTRACT

A plate type burner includes a burner main body and a plurality of burning plates mounted on the open surface of the burner main body. A flange portion enclosing the open surface is formed on the upper surface of the burner main body. The outer edge of each of the burning plates is placed on the flange portion with a sheet of packing interposed therebetween. The outer edge of each of the burning plates is pressed downward by a pressing plate. A clamping plane inclining downward to the outer side is formed on the upper surface of the outer edge of each of the burning plates. Furthermore, an inclined abutting portion contacting the clamping plane of each of the burning plates by a plane of the abutting portion is formed in the pressing plate.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a plate type burner including a box-shaped burner main body with an upper surface formed as an open surface and burning plates mounted on the open surface of the burner main body for burning a mixture gas by jetting the mixture gas from the inside of the burner main body to the outside thereof through many burner ports formed in the burning plates.

2. Description of the Related Art

Conventionally, as this type of plate type burner, the following one has been known (see, for example, Japanese Patent Application Laid-Open Publication No. 2004-333099). That is, a flange portion enclosing the open surface is formed on the upper surface of the burner main body; the outer edge of each of the burning plates is placed on the flange portion with an annular sheet of packing put between them; and the sealing property between the burner main body and each of the burning plates is secured by pressing the outer edge of each of the burning plates downward with a pressing plate to compress the packing.

Moreover, a plurality of burning plates is sometimes mounted by being arranged on the open surface of the burner main body in such a plate type burner. In this case, in order to prevent gas leakage from the butting parts of the burning plates, it becomes necessary to press the burning plates situated on both the outer sides in the arrangement direction of the plurality of burning plates to the inner side in the arrangement direction with spring members. Consequently, the number of parts increases and an increase in cost is brought about.

SUMMARY

In view of such a situation, it is an object of the present invention to provide a low cost plate type burner capable of preventing any gas leakage from butting parts of burning plates without using any spring members.

According to an aspect of the present invention, there is provided a plate type burner, comprising: a burner main body shaped in a box with an upper surface thereof being formed as an open surface; and a plurality of burning plates mounted side by side in the open surface so that a mixture gas is jetted for combustion from inside the burner main body through a multiplicity of burner ports formed in each of the burning plates. The burner main body has formed on the upper surface thereof a flange portion in a manner to enclose the open surface. Each of the burning plates is placed on the flange portion at an outer edge thereof with an annular packing being interposed therebetween such that, by pressing downward the outer edge of each of the burning plates by a pressing plate to compress the packing, sealing property is secured between the burner main body and each of the burning plates. An upper surface of the outer edge of each of the burning plates has formed therein a clamping plane inclining downward to an outer side. The pressing plate includes an inclined abutting portion coming into surface contact with the clamping plane of each of the burning plates.

According to the aspect of the invention, when each of the burning plates is pressed downward by the pressing plate, the inclined abutting portion of the pressing plate abuts against the inclined clamping plane of each of the burning plates, and a horizontal component operates on each of the burning plates. Then, the burning plates situated on both the outer sides in the arrangement direction of the plurality of burning plates are pressed to the inner side in the arrangement direction by the horizontal components operating through the clamping planes of the outer edges on the outer sides in the arrangement direction. Consequently, the gas leakage from the butting (butt joint) parts of the burning plates can be prevented without using any spring members, and the number of parts can be decreased to enable cost reduction.

Moreover, in another aspect of the invention, it is preferable that a stepped portion toward a lower direction is formed on the upper surface of each of the burning plates to enclose a region in which the burner ports are formed, and that the clamping planes are formed on outsides of the stepped portions. The abutting portion of the pressing plate abutting against the clamping planes can thereby be distant from the flames produced on the burner port forming regions, and the thermal deformation of the pressing plate is suppressed to enable the pressing plate to stably press the burning plates.

Advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Advantages of the invention may be realized and obtained by means of the instrumentalities and combinations particularly pointed out hereinafter.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the invention, and together with the general description given above and the detailed description of the embodiments given below, serve to explain the principles of the invention, in which drawings:

FIG. 1 is a sectional view showing the plate type burner of a first embodiment of the present invention; and

FIG. 2 is a sectional view showing the plate type burner of a second embodiment of the present invention.

DETAILED DESCRIPTION OF THE INVENTION

Embodiments of the present invention will be described with reference to the accompanying drawings.

With reference to FIG. 1, numeral 1 denotes a burner main body of the plate type burner of a first embodiment. The burner main body 1 is a cast made of a metal, such as an aluminum alloy, and is formed in a box with the upper surface thereof shaped as an open surface 1 a. Two burning plates 2 are mounted on the open surface 1 a by being arranged in a lateral direction. Each of the burning plates 2 is made of a ceramic, and many burner ports 2 a are formed therein. A mixture gas (mixture gas of a fuel gas and primary air) is supplied into the burner main body 1 through a not-shown mixing tube unit, and the mixture gas jets from the inner part of the burner main body 1 to the outside thereof through the burner ports 2 a of each of the burning plates 2 to be burned.

A flange portion 3 enclosing the open surface 1 a is formed on the upper surface of the burner main body 1. Then, the outer edge of each of the burning plates 2 is placed on the flange portion 3 with an annular sheet of packing 4, made from “Kaowool” (trade name of ceramic fibers produced by ISOLITE INSULATING PRODUCTS CO., LTD. of Japan) or the like, put between the outer edge and the flange portion 3, and the packing 4 is compressed by pressing the outer edge of each of the burning plates 2 with an annular pressing plate 5 downward to secure the sealing property between the burner main body 1 and each of the burning plates 2. Incidentally, although a sheet of packing punched in a square annular shape can also be used as the packing 4, two sheets of packing each punched in a letter L may be combined with each other to also constitute the square annular sheet of packing 4. Moreover, another sheet of packing 6 is provided between the burning plates 2.

The flange portion 3 is formed in a stepped shape in which the inner part 3 a on the side of the open surface 1 a is lowered than the outer part 3 b. The packing 4 is placed on the inner part 3 a of the flange portion 3. Moreover, a plurality of screw holes 3 c is formed in the outer part 3 b. Then, through holes are formed at parts of the pressing plate 5 agreeing with those of the screw holes 3 c, and the pressing plate 5 is fastened to the flange portion 3 with screws 5 a screwed into the screw holes 3 c through the through-holes.

Here, a clamping plane 2 b inclining downward toward the outer side is formed on the upper surface of the outer edge of each of the burning plates 2. Moreover, an inclined abutting portion 5 b contacting with the clamping plane 2 b of each of the burning plates 2 by a plane of the abutting portion 5 b is formed in the inner edge part of the pressing plate 5.

When the pressing plate 5 is fastened to the flange portion 3 as described above, the abutting portion 5 b abuts against the clamping plate 2 b of each of the burning plates 2 to press each of the burning plates 2 downward, and a horizontal component operates on each of the burning plates 2 through the inclined clamping plate 2 b. Then, each of the burning plates 2 is pressed to the inner side in an arrangement direction by the horizontal component operating on the outer edge of each of the burning plates 2 on the outer sides in the arrangement direction (the left side outer edge of the left side burning plate 2 and the right side outer edge of the right side burning plate 2) through the clamping plane 2 b. Consequently, without using any spring members pressing each of the burning plates 2 onto the inner side in the arrangement direction, the packing 6 provided between the butting parts of the burning plates 2 is sufficiently compressed, and gas leakage from the butting parts can be prevented. Consequently, no spring members become necessary, and the number of the parts can be reduced to achieve cost reduction.

Next, a second embodiment shown in FIG. 2 will be described. Although the second embodiment is the same as the first embodiment in the basic structure thereof, the second embodiment is different from the first embodiment in the following point. That is, in the second embodiment, a stepped portion 2 c toward a lower direction is formed on the upper surface of each of the burning plates 2 to enclose the region (burner port forming region) in which burner ports 2 a are formed. Then, also in the second embodiment, the clamping planes 2 b inclined downward toward the outer sides are formed on the outer sides of the stepped portions 2 c similarly to the first embodiment.

Also in the second embodiment, similarly to the first embodiment, each of the burning plates 2 is pressed to the inner side in the arrangement direction, and the packing 6 provided between the butting parts of the burning plates 2 is sufficiently compressed. Furthermore, by the formation of the stepped portions 2 c, the abutting portion 5 b of the pressing plate 5 abutting against the clamping planes 2 b is made to be distant from the flames produced on the burner port forming regions. Consequently, thermal deformations of the pressing plate 5 can be suppressed, and the burning plates 2 can stably be pressed.

Although the embodiments of the present invention have been described in the above with reference to the accompanying drawings, the present invention is not limited to those embodiments. For example, in the embodiments, the number of the burning plates 2 is two, but three or more burning plates can be mounted by being arranged on the open surface 1 a of the burner main body 1.

Moreover, although the upper surface of the burner main body 1 is formed as the open surface 1 a in the embodiments, the vertical direction does not regulate the directions of the burner at the time of its use, and the present invention includes also the burners used in a downward posture turning the burning plates 2 downward and a lateral posture turning the burning plates 2 into a lateral direction in addition to the burner used in the upward posture turning the burning plates 2 upward.

Additional advantages and modifications will readily occur to those skilled in the art. Therefore, the invention in its broader aspects is not limited to the specific details and representative embodiments shown and described herein. Accordingly, various modifications may be made without departing from the spirit or scope of the general inventive concept as defined by the appended claims and their equivalents. 

1. A plate type burner, comprising: a burner main body shaped in a box with an upper surface thereof being formed as an open surface; a plurality of burning plates mounted side by side in the open surface so that a mixture gas is jetted for combustion from inside the burner main body through a multiplicity of burner ports formed in each of the burning plates; the burner main body having formed on the upper surface thereof a flange portion in a manner to enclose the open surface, each of the burning plates being placed on the flange portion at an outer edge thereof with an annular packing being interposed therebetween such that, by pressing downward the outer edge of each of the burning plates by a pressing plate to compress the packing, sealing property is secured between the burner main body and each of the burning plates, wherein an upper surface of the outer edge of each of the burning plates has formed therein a clamping plane inclining downward to an outer side; and wherein the pressing plate includes an inclined abutting portion coming into surface contact with the clamping plane of each of the burning plates.
 2. The plate type burner according to claim 1, wherein a downward stepped portion to enclose a region in which the burner ports are formed is disposed on the upper surface of each of the burning plates; and wherein the clamping planes are formed on an outside of each of the stepped portions. 